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How do Siri, HomeKit, and HomeKit-enabled ecobee3 communicate with each other?

When you use Siri to control your HomeKit-enabled ecobee3, the communication occurs between HomeKit and HomeKit-enabled ecobee3 without needing to communicate with the ecobee servers.

If you are away from home, you will need an AppleTV (3rd generation or later) with AppleTV software 7.0 or later. In this case, the commands will communicate through Apple iCloud, then the Apple TV, which in turn communicates with your HomeKit-enabled ecobee3.